#include <Keypad.h>
#include <Adafruit_NeoPixel.h>

const byte COLS = 4; //four columns
const byte ROWS = 4; //four rows
char keys[ROWS][COLS] = {
  {'1','2','3','A'},
  {'4','5','6','B'},
  {'7','8','9','C'},
  {'*','0','#','D'}
};

byte rowPins[ROWS] = {9, 8, 7, 6}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {5, 4, 3, 2}; //connect to the column pinouts of the keypad

#define PIN            16  // Define the pin where the data line is connected
#define NUMPIXELS      16 // Number of LEDs in the NeoPixel ring

Adafruit_NeoPixel ring = Adafruit_NeoPixel(NUMPIXELS, PIN, NEO_GRB + NEO_KHZ800);
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );

uint16_t currentHue = 200; // Initial hue value (blue)
uint8_t currentSaturation = 255; // Full saturation
bool isBreathing = false;

void setup() {
  Serial.begin(9600);
  ring.begin(); // Initialize the NeoPixel ring
  ring.show();  // Initialize all pixels to 'off'
}

void loop() {
  char key = keypad.getKey();
  
  if (key) {
    Serial.println(key);
    
    switch(key) {
      case '1':
        Serial.println("Key 1 pressed");
        currentHue = 200; // Blue
        isBreathing = true;
        break;
      case '4':
        Serial.println("Key 4 pressed");
        currentHue = random(20, 50); // Random orange/yellow
        isBreathing = true;
        break;
      case '7':
        Serial.println("Key 7 pressed");
        currentHue = 21845; // Green (1/3 of 65535)
        isBreathing = true;
        break;
      case '*':
        Serial.println("Key * pressed");
        isBreathing = false;
        setColor(ring.Color(0, 0, 0)); // Turn off the light
        ring.show();
        break;
    }
  }

  if (isBreathing) {
    breathe(currentHue, currentSaturation, 255, 20);
  }
}

void breathe(uint16_t hue, uint8_t saturation, uint8_t maxBrightness, int delayTime) {
  // Gradually increase brightness:
  for (int brightness = 0; brightness <= maxBrightness; brightness++) {
    setColor(ring.ColorHSV(hue, saturation, brightness)); // Set color with variable brightness
    ring.show();
    delay(delayTime);
  }   
  // Gradually decrease brightness:
  for (int brightness = maxBrightness; brightness >= 0; brightness--) {
    setColor(ring.ColorHSV(hue, saturation, brightness));
    ring.show();
    delay(delayTime);
  }
}

// Helper function to set the color of all pixels
void setColor(uint32_t color) {
  for (int i = 0; i < ring.numPixels(); i++) {
    ring.setPixelColor(i, color);
  }
}